WO2023220874A1

WO2023220874A1 - End cover assembly, cell, battery and electrical device

Info

Publication number: WO2023220874A1
Application number: PCT/CN2022/093113
Authority: WO
Inventors: 李全坤; 周文林; 王鹏; 金海族
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2022-05-16
Filing date: 2022-05-16
Publication date: 2023-11-23
Also published as: CN117413412A

Abstract

The present application provides an end cover assembly, a cell, a battery and an electrical device. The end cover assembly comprises: an end cover provided with through holes; electrode terminals each at least partially located in a through hole; terminal plates insulatedly provided on the side of the end cover in the axial direction of the through holes, the terminal plates being connected to the electrode terminals; and first insulating members provided around the electrode terminals in the circumferential direction of the through holes, each at least partially clamped between an electrode terminal and a terminal plates in the axial direction, and each at least partially located between an electrode terminal and the end cover and abutting against at least one of the electrode terminal and the end cover in the radial direction of the through holes. The end cover assembly provided by the present application is low in short-circuit risk and good in safety performance.

Description

End cover components, battery cells, batteries and electrical equipment

Technical field

The present application relates to the field of batteries, and in particular to an end cover assembly, a battery cell, a battery and electrical equipment.

Background technique

Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

In the existing battery technology, the end cover assembly has the risk of short circuit, which affects the safety performance of the battery cells. Therefore, how to reduce the short circuit risk of the end cover assembly is one of the focuses of research in the industry.

Contents of the invention

In view of the above problems, this application provides an end cover assembly, a battery cell, a battery and an electrical device. The end cover assembly has low short circuit risk and good safety performance.

In a first aspect, the application provides an end cover assembly, including: an end cover having a through hole; an electrode terminal at least partially located in the through hole; and a terminal plate insulated on one side of the end cover in the axial direction of the through hole. , the terminal board is connected to the electrode terminal; the first insulating member is arranged around the electrode terminal along the circumferential direction of the through hole, and in the axial direction, the first insulating member is at least partially clamped between the electrode terminal and the terminal board, in the through hole Radially, the first insulating member is at least partially located between the electrode terminal and the end cover and abuts with at least one of the electrode terminal and the end cover.

In the technical solution of the embodiment of the present application, the end cover assembly includes an end cover, an electrode terminal, a terminal plate and a first insulating member. The electrode terminal is arranged in a through hole of the end cover, and the terminal plate is connected to the electrode terminal. Since the first insulating member Disposed around the electrode terminal, and in the axial direction of the through hole, the first insulating member is at least partially sandwiched between the electrode terminal and the terminal plate, and in the radial direction of the through hole, the first insulating member is at least partially located between the electrode terminal and the end cover and in contact with at least one of the electrode terminal and the end cover, so that when a metal wire is generated between the terminal plate and the electrode terminal, it can be clamped between the electrode terminal and the terminal plate in the axial direction by the first insulating member The part and the part located radially between the electrode terminal and the end cap realize multi-directional isolation on the transmission path from the metal wire to the end cap, preventing the metal wire from overlapping with the electrode terminal and the end cap, thereby reducing the risk of short circuit.

In some embodiments, the first insulating member includes a first insulating part and a second insulating part, and an end of the first insulating part radially away from the electrode terminal is connected to an end of the second insulating part axially facing the terminal plate, The first insulating part is at least partially sandwiched between the electrode terminal and the terminal plate, and the second insulating part is at least partially located between the electrode terminal and the end cover and abuts with at least one of the electrode terminal and the end cover.

In the end cap assembly provided by the embodiment of the present application, by making the first insulating member include a first insulating part and a second insulating part, and making the first insulating part at least partially sandwiched between the electrode terminal and the terminal plate, the first insulating part can be passed through the first insulating part. The insulating portion blocks the extension and transmission of the metal wire toward the end cover in the radial direction. By making the second insulating portion at least partially located between the electrode terminal and the end cover and abutting with at least one of the electrode terminal and the end cover, it can block the movement of the metal wire on the electrode terminal. The metal wires or metal wires on the end caps extend to each other and overlap, effectively reducing the risk of short circuits between the electrode terminals and the end caps through the metal wire overlap. Moreover, by connecting the end of the first insulating part radially away from the electrode terminal and the end of the second insulating part axially facing the terminal plate, it is convenient to form the first insulating piece and facilitate the first insulating part and the second insulating part. Installation and positioning of insulation parts.

In some embodiments, the first insulating part and the second insulating part have an integrated film structure.

The end cover assembly provided by the embodiment of the present application, by making the first insulating part and the second insulating part have an integrated film structure, can ensure the protective effect of the first insulating member and avoid metal wire overlap between the electrode terminal and the end cover. risk of short circuit. At the same time, it is also beneficial to the molding of the film layer structure, reduces the difficulty of molding, and can also ensure the connection strength between the first insulating part and the second insulating part. Moreover, it is in the form of a film layer, takes up little space, and is malleable and can have a certain amount of deformation, which is convenient for assembly.

In some embodiments, a first gap is formed between an end of the first insulating portion close to the electrode terminal and the electrode terminal in the radial direction.

The end cover assembly provided by the embodiment of the present application can facilitate the assembly of the first insulating part on the electrode terminal by forming a first gap between the end of the first insulating part close to the electrode terminal and the electrode terminal in the radial direction. Moreover, the setting of the first gap can be used to accommodate the metal wire generated during the assembly of the terminal board and the electrode terminal, to prevent the metal wire from piercing the first insulating part, and to avoid external forces such as creeping of the first insulating part when the end cover assembly is in operation. When deformed under the action of the metal wire, the metal wire extends and migrates to the side of the end cap.

In some embodiments, in the axial direction, an end of the terminal plate facing the first insulating member is formed with a cutout communicating with the first gap.

In the end cover assembly provided by the embodiment of the present application, in the axial direction, one end of the terminal board facing the first insulating member is formed with a cutout communicating with the first gap, which facilitates the assembly between the terminal board and the electrode terminal in the axial direction. At the same time, the arrangement of the cutout can reduce the frictional contact toward one end of the first insulating member when the terminal board and the electrode terminal are assembled, thereby reducing the probability of metal wires being generated when the two are assembled.

In some embodiments, in the axial direction, the orthographic projection of the cutout is located within the first gap.

In the end cover assembly provided by the embodiment of the present application, the orthographic projection of the cutout is located in the first gap in the axial direction of the through hole, so that the metal wires generated during assembly of the terminal board and the electrode terminal can all fall into In the first gap, the first insulating part can radially restrict the extension of the metal wire to the side where the end cap is located, thereby reducing the probability of short circuit.

In some embodiments, the cutout is a tapered hole, and in the axial direction, the opening of the end of the cutout toward the first insulating part is larger than the opening of the end away from the first insulating part.

The end cap assembly provided by the present application is made by making the cutout into a tapered hole, and the opening at the end of the cutout toward the first insulating part in the axial direction is larger than the opening at the end away from the first insulating part. It is beneficial to the assembly between the terminal board and the electrode terminal, and reduces the metal wires caused by friction.

In some embodiments, the electrode terminal includes a main body and a protruding portion protruding at least partially from the main body in the axial direction. The terminal plate is sleeved on the protruding portion. In the radial direction, the radial size of the main body is larger than the protruding portion. The radial dimension of the outlet is that a step surface is connected between the main part and the protruding part. The first insulating part is arranged around the protruding part and is stacked on the step surface. The second insulating part is arranged around the outer peripheral surface of the main part and is in contact with it. on the outer surface.

In the end cap assembly provided by the embodiment of the present application, the electrode terminal adopts the above structural form, so that the first insulating part can be clamped between the main body part and the terminal plate, and the second insulating part can surround and fit on the outer peripheral surface of the main body part. , effectively blocking the extended overlap of the metal wire between the electrode terminal and the end cap.

In some embodiments, the electrode terminal further includes a limiting portion. The limiting portion is provided around the main body and is located on a side of the main body away from the protruding portion in the axial direction. In the axial direction, the second insulating portion and the limiting portion A second gap is formed between the surfaces facing the protrusions.

The end cap assembly provided by the embodiment of the present application facilitates connection with components such as the end cap by causing the electrode terminal to further include a limiting portion. By forming a second gap between the second insulating part and the surface of the limiting part facing the protruding part, a margin for machining accuracy is left, and the second insulating part is prevented from being too long, causing the entire first insulating member to be in the state from the body to the electrode. There is interference during the terminal or unevenness of the first insulating part after assembly, which affects the barrier requirements of the metal wire.

In some embodiments, the end cap assembly further includes a sealing member disposed around the first insulating member and extending into the through hole, and the sealing member is at least partially sandwiched between the first insulating member and the end cap in the radial direction.

The end cover assembly provided by the embodiment of the present application can seal the edge of the through hole and improve the safety performance of the end cover assembly by arranging the sealing member around the first insulating member and extending into the through hole. At the same time, in the radial direction, the sealing member is at least partially clamped between the first insulating member and the end cover. While improving the sealing performance of the end cover assembly, it can also cooperate with the first insulating member to block the metal wire and reduce the cost of the metal wire. The probability of a short circuit between the electrode terminal and the end cap through a wire overlap.

In some embodiments, the seal is at least partially sandwiched between the electrode terminal and the end cap in the axial direction.

The end cover assembly provided by the embodiment of the present application can ensure the sealing performance between the end cover and the electrode terminal by causing the sealing member to be at least partially clamped between the electrode terminal and the end cover in the axial direction, and avoid electrolyte leakage. At the same time, it can prevent external pollutants from entering the battery.

In some embodiments, the end cover assembly further includes a second insulating member, the second insulating member is disposed around the electrode terminal, and the second insulating member is at least partially clamped between the end cover and the terminal plate in the axial direction, so that the terminal Board and end cap insulation set.

In the end cover assembly provided by the embodiment of the present application, by providing the second insulating member, the insulation between the terminal board and the end cover is facilitated, thereby improving the safety performance of the end cover assembly.

In some embodiments, the second insulating member includes a main separator and a first protrusion. The main separator is clamped between the end cover and the terminal plate in the axial direction. The first protrusion is disposed on the main separator in the radial direction. Near one end of the electrode terminal, the first protrusion extends into the through hole and abuts against the sealing member.

The end cover assembly provided by the embodiment of the present application can ensure the insulation setting requirements between the terminal board and the end cover by making the second insulating member include a main separator and a first protrusion. At the same time, the first protrusion and the The abutting relationship between the seals, by co-covering the end cover with the seal to form the wall of the through hole, can play a joint protective role with the first insulator, provide double barriers on the migration path of the metal wire, and avoid electrode terminals Short circuit with the end cap.

In some embodiments, the second insulating member further includes a second protrusion. The second protrusion is disposed on an end of the main separator radially away from the electrode terminal and extends axially toward a side away from the end cap. The second protrusion It is arranged around the terminal board in the circumferential direction and abuts against the terminal board.

The end cover assembly provided by the embodiment of the present application can limit the terminal board in the radial direction by arranging the second protrusion and causing the second protrusion to surround the terminal board in the circumferential direction and abut against the terminal board. , the outer peripheral surface of the terminal board can be protected through the second protrusion to avoid short circuit between it and the end cover, meet the insulation setting requirements between the terminal board and the end cover, and improve the safety performance of the end cover assembly.

In a second aspect, the application provides a battery cell, including a casing with an opening; the above-mentioned end cover assembly, which covers the opening and forms an accommodation cavity enclosed with the casing; and an electrode assembly, which is located in the accommodation cavity. cavity, and is electrically connected to the electrode terminal of the end cap assembly.

In a third aspect, the present application provides a battery, including the above-mentioned battery cell.

In a fourth aspect, the present application provides an electrical device. The electrical device includes the above-mentioned battery, and the battery is used to provide electrical energy.

The above description is only an overview of the technical solutions of the present application. In order to have a clearer understanding of the technical means of the present application, they can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and understandable. , the specific implementation methods of the present application are specifically listed below.

Description of the drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are for the purpose of illustrating preferred embodiments only and are not to be construed as limiting the application. Also throughout the drawings, the same reference characters are used to designate the same components. In the attached picture:

Figure 1 is a schematic structural diagram of a vehicle provided by an embodiment of the present application;

Figure 2 is a schematic structural diagram of a battery pack provided by an embodiment of the present application;

Figure 3 is a schematic diagram of the exploded structure of a battery cell provided by an embodiment of the present application;

Figure 4 is an isometric view of an end cap assembly provided by some embodiments of the present application;

Figure 5 is an exploded view of an end cap assembly provided by some embodiments of the present application;

Figure 6 is a top view of an end cap assembly provided by some embodiments of the present application;

Figure 7 is a cross-sectional view along the A-A direction in Figure 6;

Figure 8 is a partial enlarged view of B in Figure 7;

Figure 9 is a schematic structural diagram of the first insulating member provided by some embodiments of the present application;

Figure 10 is an isometric view of an electrode terminal provided by some embodiments of the present application;

Figure 11 is a schematic structural diagram of a second insulating member provided by some embodiments of the present application.

The reference numbers in the specific implementation are as follows:

1000-vehicle;

100-battery; 200-controller; 300-motor;

10-box; 11-first part; 12-second part;

20-battery cell; 21-casing; 22-electrode assembly; 23-end cover assembly;

231-end cap; 2311-through hole;

232-electrode terminal; 2321-main part; 2322-protruding part; 2322a-first shaft section; 2322b-second shaft section; 2323-limiting part;

233-terminal board; 2331-cutout;

234-the first insulating part; 2341-the first insulating part; 2342-the second insulating part;

235-Seals;

236-second insulating piece; 2361-main separator; 2362-first protrusion; 2363-second protrusion;

237-First gap; 238-Second gap;

X-axial direction; Y-radial direction.

Detailed ways

The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only used to illustrate the technical solution of the present application more clearly, and are therefore only used as examples and cannot be used to limit the protection scope of the present application.

It should be noted that, unless otherwise stated, the technical terms or scientific terms used in the embodiments of this application should have the usual meanings understood by those skilled in the art to which the embodiments of this application belong.

In the description of the embodiments of this application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back" , "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axis", "Diameter" The orientation or positional relationship indicated by “direction”, “circumferential direction”, etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply the device or element referred to. It must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be construed as a limitation on the embodiments of the present application.

In addition, the technical terms “first”, “second”, etc. are only used for descriptive purposes and cannot be understood as indicating or implying the relative importance or implicitly indicating the quantity of the indicated technical features. In the description of the embodiments of this application, "plurality" means two or more, unless otherwise explicitly and specifically limited.

In the description of the embodiments of this application, unless otherwise explicitly stated and limited, technical terms such as "installation", "connection", "connection", and "fixing" should be understood in a broad sense. For example, it can be a fixed connection, or a fixed connection. It can be detachably connected or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary; it can be the internal connection of two elements or the interaction of two elements. relation. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

In the description of the embodiments of the present application, unless otherwise expressly provided and limited, a first feature "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in direct contact. Indirect contact through intermediaries. Furthermore, the terms "above", "above" and "above" the first feature is above the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "below" and "beneath" the first feature to the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature has a smaller horizontal height than the second feature.

At present, judging from the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as in many fields such as military equipment and aerospace. . As the application fields of power batteries continue to expand, their market demand is also constantly expanding.

A battery is usually composed of multiple battery cells connected together, and the end cap assembly of the battery cell is used to extract the electric energy from the battery cell. The end cap assembly usually includes electrode terminals, terminal boards and end caps. The electrode terminal is electrically connected to the terminal board to draw out the electric energy, and the end cover is insulated from the electrode terminal and the terminal board to prevent electric energy from leaking from the end cover.

The inventor noticed that short circuit risks often occur in battery cells during use, which affects the safety performance of the battery cells and the batteries they are used in. After further research, the inventor found that during the connection process between the electrode terminal and the terminal board of the end cover assembly, some metal wires would be generated due to relative friction. During the installation process, the metal wire will extend along the gap and overlap with the end cap, thereby forming a short-circuit connection between the electrode terminal and the end cap, causing a battery cell safety accident.

In order to alleviate the problem of short circuit of battery cells, the applicant found that its end cover assembly can be improved. By blocking the propagation path of the metal wire, it reduces the probability of short circuit between the electrode terminal and the end cover through the overlapping metal wire, and improves the performance of the end cover assembly. Safety performance.

Based on the above considerations, in order to solve the problem of short circuit between the electrode terminal and the end cover, the inventor designed a new end cover assembly after in-depth research. The end cover assembly includes: an end cover with a through hole; an electrode terminal, at least partially located Through hole; terminal plate, insulated and arranged on one side of the end cover in the axial direction of the through hole, and the terminal plate is connected to the electrode terminal; the first insulating member is arranged around the electrode terminal along the circumferential direction of the through hole, in the axial direction, The first insulating member is at least partially clamped between the electrode terminal and the terminal plate. In the radial direction of the through hole, the first insulating member is at least partially located between the electrode terminal and the end cover and abuts against at least one of the electrode terminal and the end cover. catch.

In such an end cap assembly, a first insulating member is provided surrounding the electrode terminal and is at least partially sandwiched between the electrode terminal and the terminal plate in the axial direction of the through hole. Radially, the first insulating member is at least partially located between the electrode terminal and the end cover and is in contact with at least one of the electrode terminal and the end cover, so that when a metal wire is generated between the terminal plate and the electrode terminal, it can pass through the first insulation The part of the component that is clamped between the electrode terminal and the terminal plate in the axial direction and the part that is located between the electrode terminal and the end cover in the radial direction can block the transmission path from the metal wire to the end cover and avoid the metal wire and the electrode terminal. End caps are overlapped to reduce the risk of short circuits

The technical solutions described in the embodiments of this application are applicable to battery cells, batteries, and electrical equipment using batteries.

Power-consuming devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and power tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include aircraft, rockets, space shuttles, spaceships, etc.; electric toys include fixed Type or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, for example, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, planers and more. The embodiments of this application impose no special restrictions on the above electrical equipment.

It should be understood that the technical solutions described in the embodiments of the present application are not limited to the above-described battery cells, batteries, and electrical equipment using batteries, but may also be applicable to all batteries including end cap assemblies, batteries, and Electrical equipment using batteries, but for simplicity of description, the following embodiments take an electric vehicle as an example.

Please refer to FIG. 1 , which is a schematic structural diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The battery 100 is disposed inside the vehicle 1000 , and the battery 100 may be disposed at the bottom, head, or tail of the vehicle 1000 . The battery 100 may be used to power the vehicle 1000 , for example, the battery 100 may serve as an operating power source for the vehicle 1000 . The vehicle 1000 may also include a controller 200 and a motor 300 . The controller 200 is used to control the battery 100 to provide power to the motor 300 , for example, for starting, navigating and driving the vehicle 1000 .

In some embodiments of the present application, the battery 100 can not only be used as an operating power source for the vehicle 1000 , but also can be used as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

Please refer to FIG. 2 , which is an exploded view of the battery 100 provided by some embodiments of the present application. The battery 100 includes a case 10 and battery cells 20 , and the battery cells 20 are accommodated in the case 10 . Among them, the box 10 is used to provide an accommodation space for the battery cells 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12 , the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a space for accommodating the battery cells 20 of accommodation space 13. The second part 12 may be a hollow structure with one end open, and the first part 11 may be a plate-like structure. The first part 11 covers the open side of the second part 12 so that the first part 11 and the second part 12 jointly define a receiving space. 13. The first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12 . Of course, the box 10 formed by the first part 11 and the second part 12 can be in various shapes, such as cylinder, rectangular parallelepiped, etc.

In the battery 100, there may be multiple battery cells, and the multiple battery cells may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells are connected in series and in parallel. Multiple battery cells can be directly connected in series, parallel, or mixed together, and then the whole composed of multiple battery cells can be accommodated in the box 10 . Of course, the battery 100 can also be in the form of a battery module in which multiple battery cells are first connected in series, parallel or mixed, and then the multiple battery modules are connected in series, parallel or mixed to form a whole, and are accommodated in the box 10 . The battery 100 may also include other structures. For example, the battery 100 may further include a bus component for realizing electrical connections between multiple battery cells.

Each battery cell 20 may be a secondary battery or a primary battery, or may be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped or other shapes.

Please refer to FIG. 3 , which is an exploded structural diagram of a battery cell 20 provided in some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes the battery. The battery cell 20 includes a case 21 , an electrode assembly 22 and an end cap assembly 23 .

The housing 21 is a component used to cooperate with the end cap assembly 23 to form an internal environment of the battery cell 20 , wherein the formed internal environment can be used to accommodate the electrode assembly 22 , electrolyte, and other components. The housing 21 and the end cover assembly 23 may be independent components. An opening may be provided on the housing 21 , and the end cover assembly 23 covers the opening at the opening to form the internal environment of the battery cell 20 . Without limitation, the end cover assembly 23 and the housing 21 can also be integrated. Specifically, the end cover assembly 23 and the housing 21 can form a common connection surface before other components are put into the housing. When the housing 21 needs to be packaged, When inside, the end cover assembly 23 is then closed to cover the housing 21 . The housing 21 can be of various shapes and sizes, such as rectangular parallelepiped, cylinder, hexagonal prism, etc. Specifically, the shape of the housing 21 can be determined according to the specific shape and size of the electrode assembly 22 . The housing 21 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not particularly limited in the embodiments of the present application.

The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 22 may be contained within the housing 21 . The electrode assembly 22 is mainly formed by winding or stacking positive electrode sheets and negative electrode sheets, and usually a separator is provided between the positive electrode sheets and the negative electrode sheets. The portions of the positive electrode sheet and the negative electrode sheet that contain active material constitute the main body of the electrode assembly 22 , and the portions of the positive electrode sheet and the negative electrode sheet that do not contain active material constitute the tabs 221 respectively. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or respectively located at both ends of the main body. During the charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs 221 are connected to the electrode terminals to form a current loop.

The end cover assembly 23 refers to the opening of the casing 21 and is enclosed with the casing 21 to form a receiving cavity. The receiving cavity is used to accommodate the electrode assembly 22. The end cover assembly 23 isolates the internal environment of the battery cell 20 from the outside. Components of the environment. Without limitation, the shape of the end cap assembly 23 may be adapted to the shape of the housing 21 to fit the housing 21 . Optionally, the end cap assembly 23 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap assembly 23 is less likely to deform when subjected to extrusion and collision, so that the battery cell 20 can have better performance. With high structural strength, safety performance can also be improved.

Please refer to Figures 4 to 8. Figure 4 is an isometric view of the end cap assembly provided by some embodiments of the present application. Figure 5 is an exploded view of the end cover assembly provided by some embodiments of the present application. Figure 6 is an exploded view of the end cover assembly provided by some embodiments of the present application. Some embodiments provide a top view of the end cap assembly. Figure 7 is a cross-sectional view along the A-A direction in Figure 6 , and Figure 8 is a partial enlarged view of B in Figure 7 .

The end cover assembly 23 provided by the embodiment of the present application includes an end cover 231, an electrode terminal 232, a terminal board 233 and a first insulating member 234. The end cover 231 has a through hole 2311, the electrode terminal 232 is at least partially located in the through hole 2311, and the terminal board 233 is insulated on one side of the end cover 231 in the axial direction X of the through hole 2311, and the terminal plate 233 is connected to the electrode terminal 232. The first insulating member 234 is arranged around the electrode terminal 232 along the circumferential direction of the through hole 2311. In the axial direction X, the first insulating member 234 is at least partially sandwiched between the electrode terminal 232 and the terminal plate 233. In the direction Y, the first insulating member 234 is at least partially located between the electrode terminal 232 and the end cover 231 and is in contact with at least one of the electrode terminal 232 and the end cover 231 .

Optionally, the end cap 231 is a component that covers the opening of the housing 21 to isolate the internal environment of the battery cell 20 from the external environment. The end cap 231 and the housing 21 jointly define a sealed space for accommodating the electrode assembly 22, electrolyte and other components.

Optionally, the shape of the end cover 231 can be adapted to the shape of the casing 21. For example, the casing 21 has a rectangular parallelepiped structure, and the end cover 231 has a rectangular plate structure matching the casing 21. For example, the casing 21 is a cylindrical structure, and the end cap 231 is a circular plate structure that is adapted to the housing 21 . The end cap 231 can also be made of a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 231 and the shell can be the same or different.

Optionally, the electrode terminal 232 is used to electrically connect with the electrode assembly 22 to output the electrical energy of the battery cell 20 . The electrode terminal 232 may include a positive electrode terminal for electrical connection with the positive electrode tab and a negative electrode terminal for electrical connection with the negative electrode tab. The positive electrode terminal and the positive electrode tab can be connected directly or indirectly, and the negative electrode terminal and the negative electrode tab can be connected directly or indirectly.

Alternatively, an insulating structure may be provided between the terminal board 233 and the end cover 231 to insulate the terminal board 233 and the end cover 231 .

Optionally, a terminal board 233 is connected to each electrode terminal 232 .

Optionally, a mounting hole can be provided on the terminal plate 233, and the terminal plate 233 can be sleeved on the electrode terminal 232 and connected to the electrode terminal 232 through the mounting hole.

Optionally, corresponding to each electrode terminal 232, a first insulating member 234 may be provided, and the first insulating member 234 is provided around the corresponding electrode terminal 232 in the circumferential direction of the through hole 2311.

Optionally, in the axial direction It is held between the terminal plate 233 and the electrode terminal 232 . In the radial direction Y of the through hole 2311, the electrode terminal 232 is at least partially spaced from the end cover 231 and forms a second clamping space, and the first insulating member 234 is at least partially located in the second clamping space.

Optionally, the portion of the first insulating member 234 located between the electrode terminal 232 and the end cover 231 in the radial direction Y can be in contact with either the electrode terminal 232 or the end cover 231 , or of course, both at the same time. The electrode terminal 232 and the end cap 231 are in contact with each other.

Optionally, the portion of the first insulating member 234 sandwiched between the electrode terminal 232 and the terminal plate 233 and the portion of the first insulating member 234 located between the electrode terminal 232 and the end cover 231 may be connected to each other, or of course may be separated. set up.

In the end cap assembly 23 provided by the embodiment of the present application, the first insulating member 234 is arranged around the electrode terminal 232, and in the axial direction X of the through hole 2311, the first insulating member 234 is at least partially clamped between the electrode terminal 232 and the terminal plate. 233, in the radial direction Y of the through hole 2311, the first insulating member 234 is at least partially located between the electrode terminal 232 and the end cover 231 and abuts with at least one of the electrode terminal 232 and the end cover 231, so that when the terminal When a wire is generated between the plate 233 and the electrode terminal 232, the first insulating member 234 can be used to clamp the portion between the electrode terminal 232 and the terminal plate 233 in the axial direction X and between the electrode terminal 232 and the terminal plate 233 in the radial direction Y. The portion between the end caps 231 blocks the transmission path from the metal wire to the end caps 231 in multiple directions, preventing the metal wire from overlapping with the electrode terminal 232 and the end cap 231, thereby reducing the risk of short circuit.

Please refer to FIGS. 8 and 9 . FIG. 9 is a schematic structural diagram of the first insulating member 234 provided by some embodiments of the present application.

As some optional implementations, in the end cap assembly 23 provided by the embodiment of the present application, the first insulating member 234 includes a first insulating part 2341 and a second insulating part 2342. The first insulating part 2341 is away from the electrode terminal in the radial direction Y. One end of 232 is connected to an end of the second insulating part 2342 facing the terminal plate 233 in the axial direction X. The first insulating part 2341 is at least partially sandwiched between the electrode terminal 232 and the terminal plate 233. It is located between the electrode terminal 232 and the end cap 231 and is in contact with at least one of the electrode terminal 232 and the end cap 231 .

Optionally, both the first insulating part 2341 and the second insulating part 2342 may be annular structures and are respectively arranged around the electrode terminal 232 .

Alternatively, the first insulating part 2341 and the second insulating part 2342 may be distributed along the axial direction X of the through hole 2311.

Optionally, the first insulating part 2341 and the second insulating part 2342 may be of an integrated structure, or of course may be formed separately and then connected as a single body through bonding or other methods.

The end cap assembly 23 provided by the embodiment of the present application is configured such that the first insulating member 234 includes a first insulating part 2341 and a second insulating part 2342, and the first insulating part 2341 is at least partially clamped between the electrode terminal 232 and the terminal plate 233. In between, the first insulating part 2341 can block the metal wire from extending and transmitting to the end cover 231 in the radial direction Y. By making the second insulating portion 2342 at least partially located between the electrode terminal 232 and the end cover 231 and contacting at least one of the electrode terminal 232 and the end cover 231 , the metal wire on the electrode terminal 232 or the end cover 231 can be blocked. The metal wires extend to each other and overlap, effectively reducing the risk of short circuit between the electrode terminal 232 and the end cap 231 through the metal wire overlap. Moreover, by connecting the end of the first insulating part 2341 away from the electrode terminal 232 in the radial direction Y and the end of the second insulating part 2342 facing the terminal plate 233 in the axial direction X, the molding of the first insulating member 234 is facilitated, and This facilitates the installation and positioning of the first insulating part 2341 and the second insulating part 2342.

As some optional implementations, the first insulating part 2341 and the second insulating part 2342 are an integrated film layer structure.

Optionally, the first insulating part 2341 and the second insulating part 2342 may be made of the same material, which facilitates integrated molding.

Alternatively, the first insulating part 2341 and the second insulating part 2342 may be made of polypropylene or a material containing polypropylene.

Optionally, the film thicknesses of the first insulating part 2341 and the second insulating part 2342 may be the same, or of course may be different. They may be the same to facilitate molding.

Alternatively, the first insulating part 2341 and the second insulating part 2342 may be integrally formed by injection molding or other methods.

The end cover assembly 23 provided in the embodiment of the present application, by making the first insulating part 2341 and the second insulating part 2342 have an integrated film structure, can ensure the protective effect of the first insulating member 234 and avoid the contact between the electrode terminal 232 and the end cover. The overlap of metal wires between 231 causes the risk of short circuit. At the same time, it is also beneficial to the molding of the film layer structure, reduces the difficulty of molding, and can also ensure the connection strength between the first insulating part 2341 and the second insulating part 2342. Moreover, it is in the form of a film layer, takes up little space, and is malleable and can have a certain amount of deformation, which is convenient for assembly.

As some optional implementations, in the radial direction Y, a first gap 237 is formed between an end of the first insulating portion 2341 close to the electrode terminal 232 and the electrode terminal 232 .

Optionally, in the radial direction Y of the through hole 2311, an end of the first insulating portion 2341 facing the electrode terminal 232 is spaced apart from the electrode terminal 232 to form a first gap 237. The formed first gap 237 may be an annular gap. .

The end cap assembly 23 provided in the embodiment of the present application can facilitate the first insulating part by forming a first gap 237 between the end of the first insulating part 2341 close to the electrode terminal 232 and the electrode terminal 232 in the radial direction Y. 2341 is assembled on the electrode terminal 232, and the setting of the first gap 237 can be used to accommodate the metal wire generated during the assembly of the terminal plate 233 and the electrode terminal 232, to prevent the metal wire from piercing the first insulating portion 2341, and to avoid the end of the terminal plate 2341. When the cover assembly 23 is in operation, when the first insulating member 234 is deformed due to external force such as creeping, the metal wire extends and migrates toward the side where the end cover 231 is located.

In some optional embodiments, in the end cover assembly 23 provided by the embodiment of the present application, in the axial direction X, a cutout 2331 connected to the first gap 237 is formed on one end of the terminal plate 233 toward the first insulating member 234 .

Alternatively, the cutout 2331 may be extended from the surface of the terminal plate 233 mating with the electrode terminal 232 in the radial direction Y to the side where the first insulating member 234 is located.

Alternatively, the cutout 2331 may extend from the wall surrounding the mounting hole on the terminal board 233 to the side where the first insulating member 234 is located.

Alternatively, the cutout 2331 may be annular and disposed around the electrode terminal 232 .

In the end cover assembly 23 provided by the embodiment of the present application, a cutout 2331 connected to the first gap 237 is formed on one end of the terminal plate 233 toward the first insulating member 234 in the axial direction X, which facilitates the connection between the terminal plate 233 and the electrode terminal 232 . Assembly along the axis X. At the same time, the provision of the cutout 2331 enables the terminal plate 233 and the electrode terminal 232 to reduce the frictional contact toward one end of the first insulating member 234 when they are assembled, thereby reducing the probability of metal wires being generated when the two are assembled.

In some optional embodiments, in the axial direction X, the orthographic projection of the cutout 2331 is located within the first gap 237 .

Alternatively, the orthographic projection of the cutout 2331 can be understood as the orthographic projection in the axial direction X of the wall surrounding the cutout 2331 .

Optionally, the radial size of the end of the cutout 2331 away from the electrode terminal 232 in the radial direction Y is smaller than the radial size of the end of the first insulating portion 2341 facing the electrode terminal 232 .

The end cover assembly 23 provided by the embodiment of the present application makes the orthographic projection of the cutout 2331 located in the first gap 237 in the axial direction All the metal wires can fall into the first gap 237, and the first insulating portion 2341 can limit the metal wires from extending to the side where the end cover 231 is located in the radial direction Y, thereby reducing the probability of short circuit.

In some optional embodiments, the cutout 2331 may be a tapered hole. In the axial direction X of the through hole 2311 , the opening of the end of the cutout 2331 toward the first insulating part 2341 is larger than the opening of the end away from the first insulating part 2341 .

Alternatively, the cutout 2331 may be a tapered hole provided around the electrode terminal 232 .

Alternatively, the cutout 2331 may be coaxially disposed with the first through hole 2311.

Optionally, the cutout 2331 has a large mouth end and a small mouth end in the axial direction X. The small mouth end is arranged away from the first insulating portion 2341 in the axial direction X and is clearance-fitted with the electrode terminal 232 in the radial direction Y of the through hole 2311. The large-mouth end is disposed toward the first insulating portion 2341 in the axial direction X and is spaced from the electrode terminal 232 in the radial direction Y of the through hole 2311 . The distance between the large opening end and the electrode terminal 231 is smaller than the distance between the end of the first insulating portion 2341 facing the electrode terminal 232 and the electrode terminal 232 .

The end cap assembly 23 provided by this application is implemented by making the cutout 2331 a tapered hole, and in the axial direction X, the opening of the end of the cutout 2331 facing the first insulating part 2341 is larger than the opening of the end away from the first insulating part 2341. This facilitates the assembly between the terminal board 233 and the electrode terminal 232 and reduces metal wires caused by friction.

Please refer to FIGS. 8 to 10 . FIG. 10 is an isometric view of the electrode terminal 232 provided by some embodiments of the present application.

As some optional embodiments, the end cap assembly 23 provided by the embodiment of the present application, the electrode terminal 232 includes a main body part 2321 and a protruding part 2322 at least partially protruding from the main body part 2321 in the axial direction X, and the terminal plate 233 It is sleeved on the protruding part 2322. In the radial direction Y, the radial size of the main body part 2321 is larger than the radial size of the protruding part 2322. There is a step surface 2324 connected between the main body part 2321 and the protruding part 2322. The first insulation The portion 2341 is arranged around the protruding portion 2322 and is stacked on the step surface 2324. The second insulating portion 2342 is arranged around the outer peripheral surface of the main body portion 2321 and is in contact with the outer peripheral surface.

Optionally, the main body part 2321 and the protruding part 2322 can both be cylindrical structures, which can be prism or cylindrical shape respectively, or optionally cylindrical shape.

Optionally, along the axial direction Variety.

Optionally, the protruding portion 2322 may include a first shaft section 2322a and a second shaft section 2322b. The first shaft section 2322a is connected between the main body portion 2321 and the second shaft section 2322b. The radial size of the first shaft section 2322a is The radial dimension is smaller than the second shaft section 2322b, and the radial dimension of the second shaft section 2322b is smaller than the radial dimension of the main body portion 2321. The step surface 2324 is connected between the first shaft section 2322a and the main body portion 2321.

Optionally, both the main body portion 2321 and the protruding portion 2322 may be at least partially located within the through hole 2311.

Optionally, the terminal board 233 is sleeved on the protruding portion 2322 through the mounting hole and has a clearance fit with the protruding portion 2322 .

In the end cap assembly 23 provided by the embodiment of the present application, the electrode terminal 232 adopts the above structural form, so that the first insulating part 2341 can be clamped between the main body part 2321 and the terminal plate 233, and the second insulating part 2342 can surround and fit On the outer peripheral surface of the main body part 2321, the metal wire is effectively blocked from extending and overlapping between the electrode terminal 232 and the end cap 231.

As some optional embodiments, the end cap assembly 23 and the electrode terminal 232 provided by the embodiment of the present application also include a limiting part 2323. The limiting part 2323 is provided around the main body part 2321 and is located on the main body part 2321 away from the protrusion in the axial direction X. On one side of the outlet portion 2322, in the axial direction X, a second gap 238 is formed between the second insulating portion 2342 and the surface of the limiting portion 2323 facing the protruding portion 2322.

Alternatively, the limiting portion 2323 may be provided around the outer circumference of the main body portion 2321, and the radial size of the limiting portion 2323 is greater than the radial size of the main body portion 2321.

Optionally, the specific value of the second gap 238 between the second insulating part 2342 and the surface of the limiting part 2323 facing the protruding part 2322 can be set according to the insulation requirements. In an optional example, the specific value of the second gap 238 can be set in the radial direction of the through hole 2311 The projection on Y covers the side wall of the end cap 231 that forms the through hole 2311 .

The end cap assembly 23 provided in the embodiment of the present application facilitates connection with components such as the end cap 231 by causing the electrode terminal 232 to further include a limiting portion 2323. By forming the second gap 238 between the second insulating part 2342 and the surface of the limiting part 2323 facing the protruding part 2322, a margin is left to prevent the second insulating part 2342 from being too long and causing the first insulating member 234 to be assembled as a whole. There is interference when reaching the electrode terminal 232 or the first insulating part 2341 is uneven after assembly, affecting the barrier requirements of the metal wire.

As an optional embodiment, the end cover assembly 23 provided by the embodiment of the present application also includes a sealing member 235. The sealing member 235 is arranged around the first insulating member 234 and extends into the through hole 2311, in the radial direction Y. , the sealing member 235 is at least partially sandwiched between the first insulating member 234 and the end cap 231 .

Optionally, a seal 235 may be provided between each electrode terminal 232 and the end cap 231 .

Optionally, the sealing member 235 may partially extend into the through hole 2311 , or of course may completely extend into the through hole 2311 .

The end cover assembly 23 provided in the embodiment of the present application can seal the edge of the through hole 2311 by arranging the sealing member 235 and allowing the sealing member 235 to surround the first insulating member 234 and extend into the through hole 2311, thereby improving the end cap assembly 23. Safety performance of cover assembly 23. At the same time, in the radial direction Y, the sealing member 235 is at least partially clamped between the first insulating member 234 and the end cover 231. While improving the sealing performance of the end cover assembly 23, it can also cooperate with the first insulating member 234 to achieve The isolation of the metal wire reduces the probability of a short circuit between the electrode terminal 232 and the end cap 231 due to overlapping of the metal wire.

As an optional embodiment, in the end cap assembly 23 provided by the embodiment of the present application, the seal 235 is at least partially clamped between the electrode terminal 232 and the end cap 231 in the axial direction X.

Alternatively, when the electrode terminal 232 includes the limiting portion 2323, the seal 235 can be made to abut against the limiting portion 2323 in the axial direction X and be at least partially clamped between the limiting portion 2323 and the end cap 231.

The end cap assembly 23 provided by the embodiment of the present application can ensure the sealing performance between the end cap 231 and the electrode terminal 232 by causing the seal 235 to be at least partially clamped between the electrode terminal 232 and the end cap 231 in the axial direction X. , to prevent the electrolyte from leaking, and at the same time, it can prevent external pollutants from entering the battery.

Please refer to FIGS. 8 to 11 . FIG. 11 is a schematic structural diagram of the second insulating member 236 provided in some embodiments of the present application.

As an optional embodiment, the end cap assembly 23 provided by the embodiment of the present application also includes a second insulating member 236. The second insulating member 236 is arranged around the electrode terminal 232. In the axial direction X, the second insulating member 236 It is at least partially clamped between the end cover 231 and the terminal board 233 so that the terminal board 233 and the end cover 231 are insulated.

Alternatively, in the axial direction X, the second insulating member 236 may be stacked with the terminal plate 233 and the end cover 231 .

Alternatively, an escape hole may be provided on the second insulating member 236, and the electrode terminal 232 may pass through the escape hole, so that the second insulating member 236 is arranged around the electrode terminal 232.

Optionally, the surface of the end cover 231 facing the terminal plate 233 in the axial direction The height up to X.

The end cover assembly 23 provided in the embodiment of the present application facilitates the insulation between the terminal plate 233 and the end cover 231 by providing the second insulating member 236, thereby improving the safety performance of the end cover assembly 23.

As an optional embodiment, in the end cap assembly 23 provided by the embodiment of the present application, the second insulating member 236 includes a main separator 2361 and a first protrusion 2362. The main separator 2361 is clamped on the end in the axial direction X. Between the cover 231 and the terminal plate 233, a first protrusion 2362 is provided at an end of the main separator 2361 close to the electrode terminal 232 in the radial direction Y. The first protrusion 2362 extends into the through hole 2311 and abuts against the seal 235.

Alternatively, the first protrusion 2362 may be an annular structure, and the first protrusion 2362 may be spaced apart from the first insulating member 234 in the radial direction Y. Of course, it may also be in contact with the first insulating member 234 .

Alternatively, the first protrusion 2362 may be disposed coaxially with the seal 235 .

The end cover assembly 23 provided in the embodiment of the present application can ensure the insulation setting requirements between the terminal plate 233 and the end cover 231 by making the second insulating member 236 include the main separator 2361 and the first protrusion 2362. At the same time, the first The arrangement of the protrusion 2362 and the abutting relationship with the sealing member 235 can play a joint protective role with the first insulating member 234 by covering the end cover 231 with the sealing member 235 to form the wall of the through hole 2311. A double barrier is provided on the migration path of the wire to prevent the electrode terminal 232 and the end cap 231 from overlapping and short circuiting.

As an optional embodiment, in the end cap assembly 23 provided by the embodiment of the present application, the second insulating member 236 further includes a second protrusion 2363. The second protrusion 2363 is provided on the main separator 2361 in the radial direction Y. One end of the electrode terminal 232 extends along the axial direction X to a side away from the end cover 231 . The second protrusion 2363 is disposed circumferentially around the terminal plate 233 and abuts against the terminal plate 233 .

Optionally, the second protrusion 2363 may be an annular structure.

Optionally, the extending direction of the second protrusion 2363 is opposite to the extending direction of the first protrusion 2362.

Alternatively, the second protrusion 2363 and the first protrusion 2362 may be coaxially disposed.

The end cover assembly 23 provided by the embodiment of the present application has the second insulating member 236 further including a second protrusion 2363, and the second protrusion 2363 is arranged circumferentially around the terminal plate 233 and abuts against the terminal plate 233, thereby achieving The terminal board 233 can be limited in the radial direction Y, and at the same time, the outer peripheral surface of the terminal board 233 can be protected by the second protrusion 2363 to prevent it from contacting the end cover 231 and short circuit, thereby satisfying the requirements between the terminal board 233 and the end cover 231 The insulation setting requirements between them improve the safety performance of the end cover assembly 23.

In order to better understand the terminal assembly 23 provided by the embodiment of the present application, an end cover assembly 23 provided by the embodiment of the present application will be described below with a specific example. Exemplarily, the terminal assembly 23 may include an end cover 231, an electrode terminal 232, a terminal plate 233 and a first insulating member 234. The end cover 231 has a through hole 2311, the electrode terminal 232 is at least partially located in the through hole 2311, and the terminal plate 233 is insulated. On the side of the end cap 231 in the axial direction X of the through hole 2311, the terminal plate 233 is connected to the electrode terminal 232. The first insulating member 234 is arranged around the electrode terminal 232 along the circumferential direction of the through hole 2311. The first insulating member 234 includes a first insulating part 2341 and a second insulating part 2342. The first insulating part 2341 and the second insulating part 2342 are integrated. membrane structure. The first insulating part 2341 is at least partially sandwiched between the electrode terminal 232 and the terminal plate 233. In the radial direction Y, a first gap 237 is formed between an end of the first insulating part 2341 close to the electrode terminal 232 and the electrode terminal 232. In the axis direction The electrode terminal 232 includes a main body portion 2321 and a protruding portion 2322 that protrudes at least partially from the main body portion 2321 in the axial direction X. The terminal plate 233 is sleeved on the protruding portion 2322. In the radial direction Y, the diameter of the main body portion 2321 is The radial size is larger than the radial size of the protruding portion 2322. A step surface is connected between the main body portion 2321 and the protruding portion 2322. The first insulating portion 2341 is arranged around the protruding portion 2322 and is stacked on the step surface. The second insulating portion 2342 It is provided around the outer peripheral surface of the main body part 2321 and is in contact with the outer peripheral surface.

According to some embodiments of the present application, the present application also provides a battery cell, including the end cap assembly 23 described in any of the above solutions.

According to some embodiments of the present application, the present application also provides a battery, including the battery cell described in any of the above solutions.

According to some embodiments of the present application, the present application also provides an electrical device, including the battery described in any of the above solutions, and the battery is used to provide electrical energy for the electrical device.

The powered device can be any of the aforementioned devices or systems that use batteries.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; and these modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present application. The scope shall be covered by the claims and description of this application. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any way. The application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

An end cap assembly including:

End caps, with through holes;

electrode terminals located at least partially in the through holes;

A terminal board, insulated and provided on one side of the end cover in the axial direction of the through hole, and the terminal board is connected to the electrode terminal;

A first insulating member is arranged around the electrode terminal along the circumferential direction of the through hole, and in the axial direction, the first insulating member is at least partially sandwiched between the electrode terminal and the terminal plate, In the radial direction of the through hole, the first insulating member is at least partially located between the electrode terminal and the end cap and abuts with at least one of the electrode terminal and the end cap.
The end cap assembly according to claim 1, wherein the first insulating member includes a first insulating part and a second insulating part, an end of the first insulating part away from the electrode terminal in the radial direction and the The second insulating part is connected to one end of the terminal plate in the axial direction, the first insulating part is at least partially sandwiched between the electrode terminal and the terminal plate, and the second insulating part It is at least partially located between the electrode terminal and the end cap and abuts with at least one of the electrode terminal and the end cap.
The end cap assembly according to claim 2, wherein the first insulating part and the second insulating part have an integrated film structure.
The end cap assembly according to claim 2 or 3, wherein a first gap is formed between an end of the first insulating portion close to the electrode terminal and the electrode terminal in the radial direction.
The end cover assembly according to claim 4, wherein in the axial direction, an end of the terminal plate facing the first insulating member is formed with a cutout communicating with the first gap.
The end cap assembly of claim 5, wherein in the axial direction, an orthographic projection of the cutout is located within the first gap.
The end cap assembly according to claim 5 or 6, wherein the cutout is a tapered hole, and in the axial direction, the opening of the cutout towards one end of the first insulating part is larger than the opening away from the first insulating part. The opening at one end.
The end cap assembly according to any one of claims 2 to 7, wherein the electrode terminal includes a main body and a protruding portion protruding from the main body in the axial direction, and the terminal plate cover Connected to the protruding portion, in the radial direction, the radial size of the main body portion is greater than the radial size of the protruding portion, and a step surface is connected between the main body portion and the protruding portion, The first insulating part is arranged around the protruding part and is stacked on the step surface. The second insulating part is arranged around the outer peripheral surface of the main body part and is in contact with the outer peripheral surface.
The end cap assembly according to claim 8, wherein the electrode terminal further includes a limiting portion, the limiting portion is provided around the main body portion and is located on the main body portion away from the protrusion in the axial direction. On one side of the outgoing portion, in the axial direction, a second gap is formed between the second insulating portion and the surface of the limiting portion facing the protruding portion.
The end cap assembly according to any one of claims 1 to 9, wherein the end cap assembly further includes a sealing member, the sealing member is arranged around the first insulating member and extends into the through hole, in In the radial direction, the sealing member is at least partially sandwiched between the first insulating member and the end cap.
The end cap assembly of claim 10, wherein the seal is at least partially sandwiched between the electrode terminal and the end cap in the axial direction.
The end cap assembly according to claim 10 or 11, wherein the end cap assembly further includes a second insulating member, the second insulating member is arranged around the electrode terminal, and in the axial direction, the third insulating member Two insulating pieces are at least partially clamped between the end cover and the terminal board, so that the terminal board and the end cover are insulated.
The end cap assembly of claim 12, wherein the second insulating member includes a main separator and a first protrusion, the main separator is clamped between the end cap and the end cap in the axial direction. Between the terminal boards, the first protrusion is provided at one end of the main separator close to the electrode terminal in the radial direction, and the first protrusion extends into the through hole and abuts against the sealing member .
The end cap assembly of claim 13, wherein the second insulating member further includes a second protrusion disposed on a portion of the main separator facing away from the electrode terminal in the radial direction. One end extends along the axial direction to a side away from the end cover, and the second protrusion is arranged around the terminal board along the circumferential direction and abuts against the terminal board.
A battery cell, including

A shell with an opening;

The end cap assembly according to any one of claims 1 to 14, the end cap assembly covers the opening and is enclosed with the housing to form a receiving cavity;

An electrode assembly is provided in the accommodation cavity and is electrically connected to the electrode terminal of the end cap assembly.
A battery, comprising the battery cell according to claim 15.
An electrical device, wherein the electrical device includes the battery as claimed in claim 16, and the battery is used to provide electrical energy.